The Broadway Bridge structure totals 1,613 feet in length and consists of three westerly approach Pennsylvania-Petit Through truss spans of 267 feet, 282 feet and 295 feet, a 278-foot double-leaf Rall bascule main channel draw span, and one Pennsylvania-Petit Through truss of 295 feet and one Warren Through truss of 180 feet on the eastern approach. The bridge was constructed in 1911 and 1912.

One of four Willamette River crossings built in Portland during the "Roaring Twenties," Burnside Bridge, stands in age right behind the County's Hawthorne and Broadway bridges.

The Hawthorne Bridge is one of the eight major bridges that connect east and west Portland and one of the six major bridges owned by Multnomah County. Originally constructed in 1910 to carry streetcars, wagons and early motor vehicles, the Hawthorne Bridge presently accommodates only highway traffic with approximately 30,000 vehicles crossing daily on four lanes. Vertical clearance for river traffic is limited and approximately 200 openings per month are required for this vertical lift bridge.

The Morrison Bridge is an important link to the inner city network of highways and bridges. This spot on the Willamette River always has been an important crossing. Strategically located as a gateway to Downtown Portland, two other Morrison bridges--built in 1887 and 1905--preceded the current six-lane structure. Completed in May of 1958, the bridge was originally designed to link Morrison Street, Belmont Street and Water Avenue on the east side to Washington, Alder and Front Streets on the west.

Sauvie Island Bridge was designed by the Oregon State Highway Commission and built by the Gilpin Construction Co. The bridge opened December 30, 1950, retiring the Sauvie Island Ferry. Jurisdiction for the bridge was transferred to Multnomah County on August 9, 1951.

The Sellwood Bridge was the first fixed-span bridge on the lower Willamette River and a pioneer in area bridge technology. Sellwood is a rare four-span continuous truss and one of only three pre-1941 continuous trusses in Oregon.